// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package log

// Middleware is the interface of middleware for handlers.
// It's similar to middleware in HTTP stacks, where the middleware gets access to
// the entry being logged and the next handler in the stack.
type Middleware interface {
	// Wrap decorates the next handler by doing some extra work.
	Wrap(next Handler) Handler
}

// MiddlewareFunc is a function that implements Middleware.
type MiddlewareFunc func(next Handler) Handler

// Wrap implements Middleware.
func (fn MiddlewareFunc) Wrap(next Handler) Handler {
	return fn(next)
}
